cavies

from The Collaborative International Dictionary of English v.0.48

Cavy \Ca"vy\, n.; pl. {Cavies}. [NL. cavia, fr. Brazilian
   cabiai: cf. F. cabiai.] (Zool.)
   A rodent of the genera {Cavia} and {Dolichotis}, as the
   guinea pig ({Cavia cobaya}). Cavies are natives of South
   America.
   [1913 Webster]

   {Water cavy} (Zool.), The capybara.
      [1913 Webster]